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Here is a .dot example:
graph G {
e
subgraph clusterA {
a -- b;
subgraph clusterC {
C -- D;
}
}
subgraph clusterB {
d -- f
}
d -- D
e -- clusterB
clusterC -- clusterB
}
Also attached is the expected picture in png format.
Attached Thumbnails
Click image for larger version

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